24 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Oakdale | Washington County | 31,526 |
| Owatonna | Steele County | 26,733 |
| Otsego | Wright County | 25,724 |
| Oak Grove | Anoka County | 9,515 |
| Orono | Carver County | 8,191 |
| Oak Park Heights | Washington County | 4,589 |
| Osseo | Hennepin County | 2,452 |
| Olivia | Renville County | 2,284 |
| Oronoco | Olmsted County | 2,155 |
| Ortonville | Big Stone County | 1,945 |
| Osakis | Douglas County | 1,735 |
| Onamia | Mille Lacs County | 856 |
| Ottertail | Otter Tail County | 763 |
| Ogilvie | Kanabec County | 404 |
| Oklee | Red Lake County | 403 |
| Oslo | Marshall County | 238 |
| Ostrander | Fillmore County | 223 |
| Orr | St. Louis County | 211 |
| Osage | Becker County | 204 |
| Ogema | Becker County | 203 |
| Okabena | Jackson County | 199 |
| Ormsby | Martin County | 124 |
| Odin | Watonwan County | 123 |
| Odessa | Big Stone County | 102 |